Cutting fire wood into desired lengths is best done with a camp saw. Preparing kindling and tinder from the thicker wood cut by the saw, is best done with a hand ax and knife.
Boys’ Life Video: How to Sharpen a Pocket Knife (Depending on the desired type of edge, the angle of the blade on the whet stone can vary. A sharper edge is achieved by maintaining a 20-25º angle against the stone, and a stronger, longer-lasting edge is achieved by maintaining a 25-30º angle against the stone.)
Boys’ Life Video: How to Use an Ax to Chop Wood (pertaining to the use of a full-length ax)